This unique, cutting-edge resource offers you a solid understanding of the characteristics and design of lumped element quadrature hybrids - passive circuit elements used in a wide range of RF and microwave system applications. You learn how to design microstrip quadrature couplers without thin film processing, determine the practical limits to lumped element quadrature hybrid design, reduce physical dimensions of RF and microwave quadrature hybrids, and design components for ultra-wideband signal processing applications. The book shows you how lumped element quadrature hybrids have the potential for extremely wide bandwidth operation. This hands-on volume describes the synthesis of circuits, using practical circuit topologies, and provides detailed construction techniques with worked examples. Moreover, the book discusses a wide-range of related topics, including active circuits, weak couplers, non-quadrature dividers, and tips on using graphical techniques. This comprehensive reference is thoroughly supported with over 225 illustrations and all the mathematics you need.
Preface. ; Overview of Quadrature Hybrids - From Distributed to Lumped Element Design. Applications. Analysis of Quadrature Error.; Basic Theory - Loss-Less Circuits. Lumped Element Quadrature Hybrids. Approximate Phase Quadrature Hybrids.; Approximations - Optimal Goal. Polynomial Form of F(vp). Rational Form of F(vp). Second Order Optimum Rational Function. Higher Order Optimum Rational Functions. Transfer Functions in Terms of the Complex Variable. Numerator Part of the Optimum Transfer Functions. Transfer Functions of Optimum Approximate Phase Hybrids.; Passive Synthesis - Even and Odd Mode Analysis. The First Order Quadrature Hybrid. Higher Order Low-Pass Prototypes. Higher Order Optimum Rational Function Hybrids. Hybrid Synthesis Using Cascaded Sections. Cascades of First Order Sections. Cascades of Second Order Sections. Further Cascade Arrangements. Approximate Phase Hybrids. Approximate Amplitude Hybrids Based on Phase Delay Networks.; Practical Design - The First Order CircuitCoupled Inductor Design. A 435MHz Ground Inductor Hybrid Design. A 1.27GHz First Order Microstrip Hybrid. A 100-200MHz Third Order Polynomial Based Hybrid. A 1-3 GHz Mixed Element Hybrid. A 2.5-6Hz Hybrid with Coupled Transmission Lines. Optimum Second Order Hybrids. A 50-150MHz Second Order Hybrid. Higher Order Symmetrical Optimum Hybrids. A 2-32MHz First Order Cascade Hybrid. A 10-100MHz Second Order Cascade Hybrid. A 10-100MHz Appropriate Phase Hybrid. A 1-300MHz Approximate Amplitude Hybrid Based on Phase Delay Networks.; Special Topics - Active Circuits. Unequal Division and Non-Quadrature Hybrids. Power Handling. Graphical Techniques for Cascaded Couplers. A 50-550MHz Hybrid with Sections of Different Topology.; Glossary. Bibliography. Author Biography. Index. ;
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David Andrews
David Andrews is technical director of Vectawave Technology Ltd. He received his B.Sc. in electrical/electronic engineering from Brunel University, London and his Ph.D. in electronics from the University of Surrey, Guildford.